Improvement in dies for forming tubes



.l. KINTZ. Dies for Forming Tubes. N0.136,654, PatentedMarch11,1873.

AM. PHOT0-UTI1'0ERAPHIC ca. MX(ossoR1vE.s PRacEss) U NITED STATE PATENT orricn.

JOSEPH KINTZ, or MERIDEN, ASSIGNOR To HIMSELF AND P. J. CLARK, or WEST MERIDEN, CONNECTICUT.

IMPROVEMENT IN DIES FOR FORMING TUBES.

Specification forming part of Letters Patent No. 136,654, dated March 11, 1873.

To all whom it may concern:

Be it known that I, JOSEPH KINTZ, of Meriden, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Dies for Forming Tubes, of which the following is a specification:

This invention relates to the operation of forming tubes or cylinders from sheet-metal; and consists in dies and a mandrel constructed and arranged for that purpose, the dies and mode pursuedin forming the tubes or cylinders being illustrated in the annexed drawing, where- Figure 1 is an end view of the dies used in the first operation, the bed-die, and semicircular former being used. Fig. 2 is a top view of the bed-die. Fig. 3 shows the second operation, where the bed-die is reversed and a top 6 i) is used. In Fig. 4 the bed and top dies are used and the sheet-metal is formed into a complete tube. Fig. 5 represents the grooved mandrel. Fig. 6 represents a cross-section of the tube as completed.

Similar letters of reference indicate corre sponding parts.

Ais the bed-die. B is the semicircular former or die. Ois the top die. D is the mandrel, and E represents the tube. FF are removable cleats attached to the bed-die by screws, as indicated in Fig. 1.

The sheet metal, being cut to the proper width, is placed on the bed-die with its edge against the lugs G G, which are guides for placing it, and the semicircular former B is applied as seen in Fig. 1. This is the first operation. For the secondoperation the back of the bed-die is used, where there is a removable cleat, H, whose inner corner is the arc of a circle corresponding with the diameter of the tube. I is a projecting wire at each end of the die, for guiding and keeping in place the half'formed tube, which,being placed as seen, the top die 0 is applied, which forces down one of the edges, as represented in Fig. 3.

In Fig. 4 the bed-die, with all its cleats removed, is used with the top die, the two dies fitting accurately together, as seen, forcing down the remaining edge and completely forming the tube. The tube is now placed on the mandrel D, with the lap over the groove J, and the under lap is set down into the groove, as seen in Fig. 6, so that the outer surface of the tube is smooth and uniform.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The dies A, B, and C, with theremovable cleats F F and H, substantially as and for the purposes described.

2. The guides G G and I I, in combination with the dies A, B, and G, as and for the purposes described.

3. The mandrel D, with the groove J, in combination with the dies A and O, as and for the purposes described.

Witnesses: JOSEPH KINTZ.

CHARLES H. Srmw, CHARLES I. IVES. 

